Occupancy alert system



FIG. 1 is a perspective front view of an occupancy alert system, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is left side view with the right side view being a mirror image thereof; and,

FIG. 4 is a top side view with the bottom side view being a mirror thereof.

The dashed lines are intended to show a boundary area and form no part of the design thereof. 

CLAIM The ornamental design for an occupancy alert system, as shown and described. 